sigma-delta modulation problems

[EduAudio]

Hi to everybody from spain.

I am trying to design a sigma-delta modulator for my class d audio amplifier, but i don't know which components I have to use and the formulas for knowing the values of the integrer capacitors and feedback design.

Thanks.

 

[EduAudio]

Sorry I meant Integrator instead of integer.

Sorry for my english writing,

 

[Leolabs]

try to search this forum with the phrase"sigma-delta".I have seen members posted such threads.

 

[EduAudio]

Thanks Leolabs, but the threats posted don't really solve my trouble, I am in needing of more accurate design guie for sigm-delta modulator instead of such theorical guides.

 

[ssanmor]

Edu,
Si necesitas un diseño práctico, échate un vistazo al diseño de referencia de IRF, es un sigma-delta bastante sencillo.
Mira también el proyecto de Sorensen (Sorensen Audio Experiment). Tiene alguna introducción teórica y algún diseñillo práctico muy sencillo.

Oooops!
sorry: a Spanish member is not an usual thing! Translation: if you need a practical design, have a look at IRF's reference design. Read also the Sorensen Audio Experiment pages about sigma-delta modulators, they have some simple practical designs as well.

Un saludete!

Best regards,
Sergio from Madrid

 

[EduAudio]

Gracias Sergio.

Mas o menos llevo un tiempo mirandolos pero hay un par de cosines aun que no entiendo demasiado bien.(More or less I spent aome time looking at them, but there are a couple of things that i don¡t understand to much)

Is there any modulation rate in sigma-delta modulators as in PWM ones?

In that case, how do I stablish the modulation rate?

Read you soon.
Edu.